linux-kernel - Re: [PATCH 3/3] drm/msm/dsi/phy: Do not overwite PHY_CMN_CLK

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Message-ID: <lpg4ig3lzypzbv5nyzjfdz77ma5jdk3ey2hjt5htt5yd3ztfjp@i4qzlexajhvb>
Date: Fri, 31 Jan 2025 18:27:05 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] drm/msm/dsi/phy: Do not overwite PHY_CMN_CLK_CFG1
 when choosing bitclk source

On Fri, Jan 31, 2025 at 04:02:52PM +0100, Krzysztof Kozlowski wrote:
> PHY_CMN_CLK_CFG1 register has four fields being used in the driver: DSI
> clock divider, source of bitclk and two for enabling the DSI PHY PLL
> clocks.
> 
> dsi_7nm_set_usecase() sets only the source of bitclk, so should leave
> all other bits untouched.  Use newly introduced
> dsi_pll_cmn_clk_cfg1_update() to update respective bits without
> overwriting the rest.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> index 6c18b9c0e1903bbd0090aceef13ae8c6f2e080ce..8a9ee308ccffc3b9d112a994a064d8be06d9c42e 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> @@ -615,7 +615,6 @@ static int dsi_7nm_pll_restore_state(struct msm_dsi_phy *phy)
>  static int dsi_7nm_set_usecase(struct msm_dsi_phy *phy)
>  {
>  	struct dsi_pll_7nm *pll_7nm = to_pll_7nm(phy->vco_hw);
> -	void __iomem *base = phy->base;
>  	u32 data = 0x0;	/* internal PLL */
>  
>  	DBG("DSI PLL%d", pll_7nm->phy->id);
> @@ -634,7 +633,7 @@ static int dsi_7nm_set_usecase(struct msm_dsi_phy *phy)
>  	}
>  
>  	/* set PLL src */
> -	writel(data << 2, base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
> +	dsi_pll_cmn_clk_cfg1_update(pll_7nm, GENMASK(3, 2), data << 2);

This also should be defined.

>  
>  	return 0;
>  }
> 
> -- 
> 2.43.0
> 

-- 
With best wishes
Dmitry